package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {


    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;


    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入购物车中的商品是否已经存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //如果已经存在了，只需要将数量加一
        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);
        } else{
            //如果不存在，需要插入一条购物车数据
            //判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null){
                //本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);

                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                Long setmealId = shoppingCartDTO.getSetmealId();
                //本次添加到购物车的是套餐
                Setmeal setmeal = setmealMapper.getById(setmealId);

                shoppingCart.setAmount(setmeal.getPrice());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }


    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(BaseContext.getCurrentId())
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }


    /**
     * 清空购物车
     */
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }


    /**
     * 删除购物车中的一个商品
     * @param shoppingCart
     */
    public void deleteOne(ShoppingCart shoppingCart) {
        //判断数量是多少个，如果是一个的话，就给这条数据删除
        Long userId = BaseContext.getCurrentId();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        ShoppingCart cart = list.get(0);
        cart.setUserId(userId);
        if (cart.getNumber() > 1){
            //如果不是一个，那就数量减一
            cart.setNumber(cart.getNumber()-1);
        }else {
            shoppingCartMapper.deleteCart(cart);
        }

    }
}
